Karl Marx saw religion as an opiate of the poor: it soothed them so that they did not rise up against their capitalist oppressors. For Marx, this short-term relief hardly outweighed the long-term cost of poverty. It turns out that Marx may have been right. Research by political scientists Frederick Solt, Philip Habel, and J. Tobin Grant (all from Southern Illinois University) suggests that greater economic inequality correlates with greater religiosity, a correlation which they argue stems from the rich using religion to discourage wealth redistribution.